package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import com.sky.vo.UserLoginVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {
    public static final String WX_LOGIN_URL = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    UserMapper userMapper;

    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        // 调用微信接口服务，获得openid
        String openid = getOpenid(userLoginDTO.getCode());

        // 判断用户是否为空，空表示登入失败
        if (openid == null) {
            throw new LoginFailedException("微信登入失败");
        }

        // 判断用户是否为新用户,如果是新用户，自动完成注册
        User user = userMapper.getByOpenid(openid);

        if (user == null) {
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now()) // 查询操作不涉及填充公共字段
                    .build();
            userMapper.insert(user);
        }

        // 返回用户对象
        return user;
    }

    /**
     * 调用微信接口服务，获得openid
     * @param code
     * @return
     */
    private String getOpenid(String code) {
        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", code);
        map.put("grant_type", "authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN_URL, map);

        JSONObject jsonObject = JSON.parseObject(json);
        return jsonObject.getString("openid");
    }
}
